gabeNC
Member
Howdy,
I have a 555 timer wired as a astable, flashing a LED every second or so. I also have 16f876a wired on the same breadboard and working through a seven segment tutorial. Why both? I dunno... cause it's cool to have a bunch of flashing lights. Makes my kids think I know what i'm doing.![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
The PIC is programmed to display 0 through 9 on the seven segment and then loops back to 0 with a delay of a second or so. The display randomly jumps back to 0 part way through the sequence, to me indicating a reset.
If I disconnect the power to the 555 circuit, the PIC is fine. I have a 4.7K resistor tied to MCLR and I disconnect the pickit2 before flipping the power supply switch.
Power is supplied from a 9V wall wart into a 7805. I just noticed I do not have any power decouping capacitors. Is that the idea behind it? For lack of a better term, "insulating" one circuit from another? Preventing noise or interference?
thanks.
I have a 555 timer wired as a astable, flashing a LED every second or so. I also have 16f876a wired on the same breadboard and working through a seven segment tutorial. Why both? I dunno... cause it's cool to have a bunch of flashing lights. Makes my kids think I know what i'm doing.
The PIC is programmed to display 0 through 9 on the seven segment and then loops back to 0 with a delay of a second or so. The display randomly jumps back to 0 part way through the sequence, to me indicating a reset.
Power is supplied from a 9V wall wart into a 7805. I just noticed I do not have any power decouping capacitors. Is that the idea behind it? For lack of a better term, "insulating" one circuit from another? Preventing noise or interference?
thanks.